Optical imaging system

ABSTRACT

An optical imaging system includes a first lens, a second lens, a third lens having positive refractive power, a fourth lens, and a fifth lens disposed from an object side. In the optical imaging system, 0.2&lt;(D23+D34+D45)/BFL&lt;0.95 and 0.8&lt;TTL/f&lt;0.95, where D23 is a distance from an image-side surface of the second lens to an object-side surface of the third lens, D34 is a distance from an image-side surface of the third lens to an object-side surface of the fourth lens, D45 is a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens, BFL is a distance from an image-side surface of the fifth lens to an imaging plane, TTL is a distance from an object-side surface of the first lens to the imaging plane, and f is a focal length of the optical imaging system.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit under 35 USC 119(a) of Korean PatentApplication No. 10-2020-0053742 filed on May 6, 2020 in the KoreanIntellectual Property Office, the entire disclosure of which isincorporated herein by reference for all purposes.

BACKGROUND 1. Field

This application relates to an optical imaging system configured to foldan optical path.

2. Description of Related Art

A small-sized camera may be mounted in a wireless terminal device. Forexample, small-sized cameras may be mounted on a front surface and arear surface of a wireless terminal device, respectively. Sincesmall-sized cameras are used for various purposes such as outdoorscenery pictures, indoor portrait pictures, and the like, they arerequired to have performance comparable to that of ordinary cameras.However, it may be difficult for a small-sized camera to implement highperformance because a mounting space of the small-sized camera isrestricted by a size of a wireless terminal device. Accordingly, thereis a need for development of an optical imaging system which may improveperformance of a small-sized camera without increasing a size of thesmall-sized camera.

SUMMARY

This Summary is provided to introduce a selection of concepts insimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

An optical imaging system which may be mounted in a thinned small-sizedterminal device while having a large focal length.

In one general aspect, an optical imaging system includes a first lens,a second lens, a third lens having positive refractive power, a fourthlens, and a fifth lens disposed in order from an object side. In theoptical imaging system, 0.2<(D23+D34+D45)/BFL<0.95 and 0.8<TTL/f<0.95,where D23 is a distance from an image-side surface of the second lens toan object-side surface of the third lens, D34 is a distance from animage-side surface of the third lens to an object-side surface of thefourth lens, D45 is a distance from an image-side surface of the fourthlens to an object-side surface of the fifth lens, BFL is a distance froman image-side surface of the fifth lens to an imaging plane, TTL is adistance from an object-side surface of the first lens to the imagingplane, and f is a focal length of the optical imaging system.

The second lens may have negative refractive power.

A sum of a refractive index of the second lens and a refractive index ofthe third lens may be greater than 3.20.

An absolute value of a sum of a focal length of the first lens and afocal length of the second lens may be less than 2.0.

The optical imaging system may satisfy |f/f1+f/f2|<1.2, where f1 is afocal length of the first lens and f2 is a focal length of the secondlens.

The optical imaging system may satisfy 0≤D12/f≤0.07, where D12 is adistance from an image-side surface of the first lens to an object-sidesurface of the second lens.

The optical imaging system may satisfy 0.62≤EL1S1/ImgHT≤0.94, whereEL1S1 is an effective radius of the object-side surface of the firstlens and ImgHT is a height of the imaging plane.

The optical imaging system may satisfy 0.8≤EL1S2/EL1S1≤1.01, where EL1S1is an effective radius of the object-side surface of the first lens andEL1S2 is an effective radius of an image-side surface of the first lens.

The optical imaging system may satisfy 3.5≤TTL/ImgHT, where ImgHT is aheight of the imaging plane.

The optical imaging system may satisfy R1/f≤0.265, where R1 is a radiusof curvature of the object-side surface of the first lens.

An optical imaging system includes a first lens having refractive power,a second lens having refractive power, a third lens having refractivepower, a fourth lens having refractive power, and a fifth lens havingpositive refractive power. In the optical imaging system, a thickness T1in a center of an optical axis of the first lens and a distance TTL froman object-side surface of the first lens to an imaging plane satisfy0.08<T1/TTL<0.18.

An image-side surface of the third lens may be concave.

An object-side surface of the fourth lens may be convex.

An image-side surface of the fourth lens may be concave.

An object-side surface of the fifth lens may be convex.

The optical imaging system may satisfy 2.4<(V2+V4)/V3, where V2 is anAbbe number of the second lens, V3 is an Abbe number of the third lens,and V4 is an Abbe number of the fourth lens.

Other features and aspects will be apparent from the following detaileddescription, the drawings, and the claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a configuration of an optical imaging systemaccording to a first example.

FIG. 2 is an aberration curve of the optical imaging system illustratedin FIG. 1.

FIG. 3 illustrates a configuration of an optical imaging systemaccording to a second example.

FIG. 4 is an aberration curve of the optical imaging system illustratedin FIG. 3.

FIG. 5 illustrates a configuration of an optical imaging systemaccording to a third example.

FIG. 6 is an aberration curve of the optical imaging system illustratedin FIG. 5.

FIG. 7 illustrates a configuration of an optical imaging systemaccording to a fourth example.

FIG. 8 is an aberration curve of the optical imaging system illustratedin FIG. 7.

FIG. 9 illustrates a configuration of an optical imaging systemaccording to a fifth example.

FIG. 10 is an aberration curve of the optical imaging system illustratedin FIG. 9.

FIG. 11 illustrates a configuration of an optical imaging systemaccording to a sixth example.

FIG. 12 is an aberration curve of the optical imaging system illustratedin FIG. 11.

FIG. 13 illustrates a configuration of an optical imaging systemaccording to a seventh example.

FIG. 14 is an aberration curve of the optical imaging system illustratedin FIG. 13.

FIG. 15 is a configuration diagram of an optical imaging systemaccording to an eighth example.

FIG. 16 is an aberration curve of the optical imaging system illustratedin FIG. 15.

FIG. 17 illustrates a configuration of an optical imaging systemaccording to a ninth example.

FIG. 18 is an aberration curve of the optical imaging system illustratedin FIG. 17.

FIGS. 19 and 20 are modified examples of an optical imaging system.

FIGS. 21 and 22 are rear views of portable terminal devices, each havingan optical imaging system according to an example.

Throughout the drawings and the detailed description, the same referencenumerals refer to the same elements. The drawings may not be to scale,and the relative size, proportions, and depiction of elements in thedrawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. However, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be apparent to one of ordinary skill inthe art. The sequences of operations described herein are merelyexamples, and are not limited to those set forth herein, but may bechanged as will be apparent to one of ordinary skill in the art, withthe exception of operations necessarily occurring in a certain order.Also, descriptions of functions and constructions that would be wellknown to one of ordinary skill in the art may be omitted for increasedclarity and conciseness.

The features described herein may be embodied in different forms, andare not to be construed as being limited to the examples describedherein. Rather, the examples described herein have been provided so thatthis disclosure will be thorough and complete, and will fully convey thescope of the disclosure to one of ordinary skill in the art.

Herein, it is noted that use of the term “may” with respect to anexample or embodiment, e.g., as to what an example or embodiment mayinclude or implement, means that at least one example or embodimentexists in which such a feature is included or implemented while allexamples and embodiments are not limited thereto.

Throughout the specification, when an element, such as a layer, region,or substrate, is described as being “on,” “connected to,” or “coupledto” another element, it may be directly “on,” “connected to,” or“coupled to” the other element, or there may be one or more otherelements intervening therebetween. In contrast, when an element isdescribed as being “directly on,” “directly connected to,” or “directlycoupled to” another element, there can be no other elements interveningtherebetween.

As used herein, the term “and/or” includes any one and any combinationof any two or more of the associated listed items.

Although terms such as “first,” “second,” and “third” may be used hereinto describe various members, components, regions, layers, or sections,these members, components, regions, layers, or sections are not to belimited by these terms. Rather, these terms are only used to distinguishone member, component, region, layer, or section from another member,component, region, layer, or section. Thus, a first member, component,region, layer, or section referred to in examples described herein mayalso be referred to as a second member, component, region, layer, orsection without departing from the teachings of the examples.

Spatially relative terms such as “above,” “upper,” “below,” and “lower”may be used herein for ease of description to describe one element'srelationship to another element as illustrated in the figures. Suchspatially relative terms are intended to encompass differentorientations of the device in use or operation in addition to theorientation depicted in the figures. For example, if the device in thefigures is turned over, an element described as being “above” or “upper”relative to another element will then be “below” or “lower” relative tothe other element. Thus, the term “above” encompasses both the above andbelow orientations depending on the spatial orientation of the device.The device may also be oriented in other ways (for example, rotated 90degrees or at other orientations), and the spatially relative terms usedherein are to be interpreted accordingly.

The terminology used herein is for describing various examples only, andis not to be used to limit the disclosure. The articles “a,” “an,” and“the” are intended to include the plural forms as well, unless thecontext clearly indicates otherwise. The terms “comprises,” “includes,”and “has” specify the presence of stated features, numbers, operations,members, elements, and/or combinations thereof, but do not preclude thepresence or addition of one or more other features, numbers, operations,members, elements, and/or combinations thereof.

Due to manufacturing techniques and/or tolerances, variations of theshapes illustrated in the drawings may occur. Thus, the examplesdescribed herein are not limited to the specific shapes illustrated inthe drawings, but include changes in shape that occur duringmanufacturing.

The features of the examples described herein may be combined in variousways as will be apparent after an understanding of the disclosure ofthis application. Further, although the examples described herein have avariety of configurations, other configurations are possible as will beapparent after an understanding of the disclosure of this application.

The drawings may not be to scale, and the relative sizes, proportions,and depiction of elements in the drawings may be exaggerated forclarity, illustration, and convenience.

In the examples, a first lens refers to a lens most adjacent to anobject (or a subject), and a fifth lens refers to a lens most adjacentto an imaging plane (or an image sensor). In the example embodiments,units of a radius of curvature, a thickness, a TTL, an Img_HT (a heightof an imaging plane: half of a diagonal length of an imaging plane), anda focal length are indicated in millimeters (mm). A thickness of a lens,a gap between lenses, and a TTL refer to a distance of a lens in anoptical axis. Also, in the descriptions of a shape of a lens, theconfiguration in which one surface is convex indicates that an opticalaxis region of the surface is convex, and the configuration in which onesurface is concave indicates that an optical axis region of the surfaceis concave. Thus, even when it is described that one surface of a lensis convex, an edge of the lens may be concave. Similarly, even when itis described that one surface of a lens is concave, an edge of the lensmay be convex.

The optical imaging system includes an optical system including aplurality of lenses. For example, the optical system of the opticalimaging system may include a plurality of lenses having refractivepower. However, the optical imaging system does not only include lenseshaving refractive power. For example, the optical imaging system mayinclude a prism for refracting incident light and a stop for adjustingthe amount of light. The optical imaging system may also include aninfrared cut-off filter for blocking infrared rays. The optical imagingsystem may further include an image sensor (for example, an imagingdevice) configured to convert an image of a subject incident through theoptical system into an electrical signal. The optical imaging system mayfurther include a gap maintaining member for adjusting a distancebetween lenses.

The plurality of lenses may be formed of a material having a refractiveindex different from that of air. For example, the plurality of lensesmay be formed of a plastic or glass material. At least one of theplurality of lenses may have an aspherical shape. An aspherical surfaceof the lens may be represented by equation 1 as below.

$\begin{matrix}{Z = {\frac{c\; r^{2}}{1 + \sqrt{1 - {\left( {1 + k} \right)c^{2}r^{2}}}} + {Ar^{4}} + {Br^{6}} + {C\; r^{8}} + {D\; r^{10}} + {E\; r^{12}} + {Fr^{14}} + {G\; r^{16}} + {Hr^{18}} + {J\; r^{20}}}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

In equation 1, “c” is an inverse of a radius of a curvature of arespective lens, “k” is a conic constant, “r” is a distance from acertain point on an aspherical surface of the lens to an optical axis,“A to J” are aspheric constants, “Z” (or SAG) is a height from a certainpoint on an aspherical surface of the lens to an apex of the asphericalsurface in an optical axis direction.

The optical imaging system may include five or more lenses. For example,the optical imaging system may include a first lens, a second lens, athird lens, a fourth lens, and a fifth lens disposed in order from anobject side.

The first to fifth lenses may be disposed with a gap with respect toadjacent lenses. For example, a certain gap may be formed between animage-side surface of a lens and an object-side surface of an adjacentlens.

The first lens has a certain refractive power. For example, the firstlens may have positive refractive power. One surface of the first lensis convex. For example, an object-side surface of the first lens may beconvex. The first lens has a certain refractive index. For example, thefirst lens may have a refractive index less than 1.56. The first lenshas a certain focal length. For example, the focal length of the firstlens may be determined within a range of 4.0 to 8.0 mm.

The second lens has a certain refractive power. For example, the secondlens may have negative refractive power. One surface of the second lensis concave. For example, an object-side surface or an image-side surfaceof the second lens may be concave. The second lens has a certainrefractive index. For example, the refractive index of the second lensmay be 1.6 or more to less than 1.8. The second lens has a certain focallength. For example, the focal length of the second lens may bedetermined within a range of −7.0 to −3.0 mm.

The third lens has a certain refractive power. For example, the thirdlens may have positive refractive power. One surface of the third lensis convex. For example, an object-side surface or an image-side surfaceof the third lens may be convex. The third lens has a certain refractiveindex. For example, the third lens may have a refractive index of 1.65or more to less than 2.0. In addition, the refractive index of the thirdlens may be greater than the refractive index of the second lens. Thethird lens has a certain focal length. For example, the focal length ofthe third lens may be determined within a range of 4.6 to 20 mm.

The fourth lens has a certain refractive power. For example, the fourthlens may have positive or negative refractive power. One surface of thefourth lens has a concave shape. For example, an object-side surface oran image-side surface of the fourth lens may be concave. The fourth lenshas a certain refractive index. For example, the fourth lens may have arefractive index of 1.6 or more to less than 1.8.

The fifth lens has a certain refractive power. For example, the fifthlens may have positive or negative refractive power. One surface of thefifth lens is concave. For example, an object-side surface or animage-side surface of the fifth lens may be concave. The fifth lens hasa certain refractive index. For example, the fifth lens may have arefractive index of 1.5 or more to less than 1.6.

The optical imaging system includes a lens formed of plastic. Forexample, in the optical imaging system, at least one of the five or morelenses constituting a lens group may be formed of a plastic material.The optical imaging system includes an aspherical lens. For example, inthe optical imaging system, at least one of the five or more lensesconstituting a lens group may include an aspherical lens.

The optical imaging system may include a member configured to fold orrefract an optical path. For example, the optical imaging system mayinclude one or more prisms. The one or more prisms may be disposed on anobject side of the first lens or an object-side surface of the firstlens and an image side of the fifth lens. The one or more prisms mayhave a refractive index higher than the refractive index of the thirdlens. For example, the refractive index of the prism may be 1.7 or more.

The optical imaging system includes a filter, a stop, and image sensor.The filter is disposed between a lens, disposed to be closest to animaging plane, and an image sensor. The filter blocks certainwavelengths from incident light to improve a resolution of the opticalimaging system. For example, the filter may block an infrared wavelengthof the incident light. An f number of the optical imaging system may be2.6 or more.

The optical imaging system may satisfy one or more of conditionalexpressions below.

3.2<n2+n3

|f1+f2|<2.0

|f/f1+f/f2|<1.2

0≤D12/f≤0.07

0.62≤EL1S1/ImgHT≤0.94

0.8≤EL1S2/EL1S1≤1.01

0.8≤TTL/f≤0.95

3.5≤TTL/ImgHT

R1/f≤0.265

0.08<T1/TTL<0.18

In the above conditional expressions, “n2” is the refractive index ofthe second lens, “n3” is the refractive index of the third lens, “f” isa focal length of the optical imaging system, “f1” is a focal length ofthe first lens, “f2” is a focal length of the second lens, “D12” is adistance from an image-side surface of the first lens to an object-sidesurface of the second lens, “EL1S1” is an effective radius of anobject-side surface of the first lens, “EL1S2” is an effective radius ofthe image-side surface of the first lens, “TTL” is a distance from theobject-side surface of the first lens to the imaging plane, “ImgHT” is aheight of the imaging plane (half of a diagonal length of the imagingplane), “R1” is a radius of curvature of the object-side surface of thefirst lens, and “T1” is a thickness in a center of an optical axis ofthe first lens.

The optical imaging system may additionally satisfy at least one ofconditional expressions below.

0.4<BFL/f

0.4<BFL/TTL

2.1<BFL/ImgHT

2.1<f/ImgHT

0.3<(D23+D45)/BFL

0.15<D23/BFL

0.15<D45/BFL

0.2<(D23+D34+D45)/BFL<  0.5

0.8<(L1S1:L5S2)/BFL<1.2

(n2+n4)/n3<2.0

2.4<(V2+V4)/V3

In the above conditional expressions, “BFL” is a distance from animage-side surface of the fifth lens to the imaging plane, “D23” is adistance from an image-side surface of the second lens to an object-sidesurface of the third lens, “D34” is a distance from an image-sidesurface of the third lens to an object-side surface of the fourth lens,“D45” is a distance from an image-side surface of the fourth lens to anobject-side surface of the fifth lens, “L1S1:L5S2” is a distance fromthe object-side surface of the first lens to the image-side surface ofthe fifth lens, “n4” is a refractive index of the fourth lens, “V2” isan Abbe number of the second lens, “V3” is an Abbe number of the thirdlens, and “V4” is an Abbe number of the fourth lens.

Hereinafter, optical imaging systems according to various examples willbe described.

An optical imaging system according to a first example will be describedwith reference to FIG. 1.

The optical imaging system 100 may include a first lens 110, a secondlens 120, a third lens 130, a fourth lens 140, and a fifth lens 150.

The first lens 110 has positive refractive power. In the first lens 110,an object-side surface is convex and an image-side surface is convex.The second lens 120 has negative refractive power. In the second lens120, an object-side surface is concave and an image-side surface isconcave. The third lens 130 has positive refractive power. In the thirdlens 130, an object-side surface is convex and an image-side surface isconcave. The fourth lens 140 has negative refractive power. In thefourth lens 140, an object-side surface is convex and an image-sidesurface is concave. The fifth lens 150 has positive refractive power. Inthe fifth lens 150, an object-side surface is convex and an image-sidesurface is concave.

The optical imaging system 100 may include a filter IF and an imagesensor IP. The filter IF may be disposed in front of the image sensor IPto block infrared rays, or the like, included in incident light. Theimage sensor IP may include a plurality of optical sensors. Theabove-configured image sensor IP may be configured to convert an opticalsignal into an electrical signal. The image sensor IP may form animaging plane for imaging light incident through the first lens 110 tothe fifth lens 150.

The optical imaging system 100 may include an optical path changingmechanism. For example, the optical imaging system 100 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 1 illustrates lens characteristics of the optical imaging system100, and Table 2 illustrates a spherical values of the optical imagingsystem 100. FIG. 2 is an aberration curve of the above-configuredoptical imaging system 100.

TABLE 1 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tive No.Remark Curvature Distance Index Number Radius S1 Prism Infinity 0.0006.000 S2 Infinity 6.300 1.723 29.5 6.000 S3 Infinity 6.300 1.723 29.58.485 S4 Infinity 9.000 6.000 S5 First Lens 4.98 2.121 1.534 55.7 2.965S6 −11.61 0.100 2.777 S7 Second −62.32 1.232 1.615 26.0 2.614 S8 Lens4.14 1.442 2.137 S9 Third Lens 4.85 1.109 1.671 19.2 1.997 S10 23.100.100 1.832 S11 Fourth 14.73 0.500 1.615 26.0 1.783 S12 Lens 3.27 1.5051.590 S13 Fifth Lens 6.12 0.899 1.544 56.1 2.030 S14 12.25 8.403 2.030S15 Filter Infinity 0.210 1.519 64.2 4.074 S16 Infinity 0.379 4.107 S17Imaging Infinity 0.000 4.202 Plane

TABLE 2 Aspherical Constant S5 S6 S7 S8 S9 K −0.66498 −2.29482 23.170550.05990 0.06127 A 0.00029 0.00075 −0.00145 −0.00327 −0.00276 B 0.00000−0.00002 0.00012 0.00002 0.00020 C 0.00000 0.00000 0.00000 −0.00001−0.00001 D 0.00000 0.00000 0.00000 0.00000 0.00000 E 0.00000 0.000000.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.000000.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000 AsphericalConstant S10 S11 S12 S13 S14 K −2.70287 3.07508 −0.07208 −1.03685−8.43430 A −0.00298 −0.00267 −0.00583 −0.00551 −0.00366 B 0.00031−0.00005 0.00036 0.00025 0.00000 C −0.00002 0.00004 0.00011 0.000080.00003 D 0.00000 −0.00001 0.00002 0.00001 0.00001 E 0.00000 0.00000−0.00001 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.000000.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

Hereinafter, an optical imaging system according to a second examplewill be described with reference to FIG. 3.

The optical imaging system 200 may include a first lens 210, a secondlens 220, a third lens 230, a fourth lens 240, and a fifth lens 250.

The first lens 210 has positive refractive power. In the first lens 210,an object-side surface is convex and an image-side surface is convex.The second lens 220 has negative refractive power. In the second lens220, an object-side surface is concave and an image-side surface isconcave. The third lens 230 has positive refractive power. In the thirdlens 230, an object-side surface is convex and an image-side surface isconcave. The fourth lens 240 has negative refractive power. In thefourth lens 240, an object-side surface is convex and an image-sidesurface is concave. The fifth lens 250 has positive refractive power. Inthe fifth lens 250, an object-side surface is convex and an image-sidesurface is concave.

The optical imaging system 200 may include a filter IF, an image sensorIP. The filter IF may be disposed in front of the image sensor IP toblock infrared rays, or the like, included in incident light. The imagesensor IP may include a plurality of optical sensors. Theabove-configured image sensor IP may be configured to convert an opticalsignal into an electrical signal. The image sensor IP may form animaging plane for imaging light incident through the first lens 210 tothe fifth lens 250.

The optical imaging system 200 may include an optical path changingmechanism. For example, the optical imaging system 200 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 3 illustrates lens characteristics of the optical imaging system200, and Table 4 illustrates a spherical values of the optical imagingsystem 200. FIG. 4 is an aberration curve of the above-configuredoptical imaging system 200.

TABLE 3 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tive No.Remark Curvature Distance Index Number Radius S1 Prism Infinity 6.0005.757 S2 Infinity 6.000 1.723 29.5 5.500 S3 Infinity 4.000 1.723 29.58.000 S4 Infinity 2.350 5.500 S5 First Lens 4.96 2.341 1.534 55.7 2.965S6 −15.58 0.100 2.677 S7 Second −94.88 0.888 1.639 23.5 2.555 S8 Lens4.14 1.242 2.180 S9 Third Lens 3.95 0.961 1.671 19.2 2.057 S10 33.130.100 1.945 S11 Fourth 13.70 0.500 1.639 23.5 1.873 S12 Lens 3.01 1.2281.635 S13 Fifth Lens 6.25 0.899 1.544 56.1 2.030 S14 10.61 8.353 2.030S15 Filter Infinity 0.210 1.519 64.2 3.904 S16 Infinity 1.174 3.935 S17Imaging Infinity 0.004 4.212 Plane

TABLE 4 Aspherical Constant S5 S6 S7 S8 S9 K −0.65434 −1.10165 −99.000000.04811 0.03444 A 0.00030 0.00071 −0.00144 −0.00332 −0.00286 B 0.00000−0.00002 0.00012 0.00001 0.00019 C 0.00000 0.00000 0.00000 −0.00001−0.00001 D 0.00000 0.00000 0.00000 0.00000 0.00000 E 0.00000 0.000000.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.000000.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000 AsphericalConstant S10 S11 S12 S13 S14 K 71.93392 −0.24152 −0.04750 −1.13402−7.13739 A −0.00288 −0.00277 −0.00558 −0.00556 −0.00358 B 0.00032−0.00006 0.00034 0.00030 −0.00001 C −0.00002 0.00004 0.00010 0.000090.00004 D 0.00000 −0.00001 0.00002 0.00001 0.00001 E 0.00000 0.00000−0.00001 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.000000.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

Hereinafter, an optical imaging system according to a third example willbe described with reference to FIG. 5.

The optical imaging system 300 may include a first lens 310, a secondlens 320, a third lens 330, a fourth lens 340, and a fifth lens 350.

The first lens 310 has positive refractive power. In the first lens 310,an object-side surface is convex and an image-side surface is convex.The second lens 320 has negative refractive power. In the second lens320, an object-side surface is concave and an image-side surface isconcave. The third lens 330 has positive refractive power. In the thirdlens 330, an object-side surface convex and an image-side surface isconcave. The fourth lens 340 has negative refractive power. In thefourth lens 340, an object-side surface is convex and an image-sidesurface is concave. The fifth lens 350 has positive refractive power. Inthe fifth lens 350, an object-side surface is convex and an image-sidesurface is concave.

The optical imaging system 300 may include a filter IF and an imagesensor IP. The filter IF may be disposed in front of the image sensor IPto block infrared rays included in incident light. The image sensor IPmay include a plurality of optical sensors. The above-configured imagesensor IP may be configured to convert an optical signal into anelectrical signal. The image sensor IP may form an imaging plane forimaging light incident through the first lens 310 to the fifth lens 350.

The optical imaging system 300 may include an optical path changingmechanism. For example, the optical imaging system 300 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 5 illustrates lens characteristics of the optical imaging system300, and Table 6 illustrates aspherical values of the optical imagingsystem 300. FIG. 6 is an aberration curve of the above-configuredoptical imaging system 300.

TABLE 5 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tive No.Remark Curvature Distance Index Number Radius S1 Prism Infinity 0.0005.396 S2 Infinity 5.500 1.723 29.5 5.000 S3 Infinity 5.500 1.723 29.57.000 S4 Infinity 3.000 5.000 S5 First Lens 4.61 2.218 1.534 55.7 2.900S6 −10.08 0.113 2.668 S7 Second −9.30 0.300 1.615 26.0 2.633 S8 Lens4.79 0.890 2.397 S9 Third Lens 7.54 1.067 1.671 19.2 2.359 S10 74.150.100 2.348 S11 Fourth 5.45 1.071 1.615 26.0 2.299 S12 Lens 3.82 2.8152.163 S13 Fifth Lens 4.62 0.506 1.534 55.7 2.754 S14 4.65 5.563 2.696S15 Filter Infinity 0.210 1.519 64.2 3.592 S16 Infinity 3.148 3.617 S17Imaging Infinity −0.001 4.202 Plane

TABLE 6 Aspherical Constant S5 S6 S7 S8 S9 K −0.62152 0.00000 0.000000.00000 0.00000 A 0.00029 0.00193 0.00094 −0.00303 −0.00022 B 0.000020.00002 0.00010 0.00002 −0.00001 C 0.00000 −0.00002 −0.00003 0.00000−0.00002 D 0.00000 0.00000 0.00000 0.00000 0.00000 E 0.00000 0.000000.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.000000.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000 AsphericalConstant S10 S11 S12 S13 S14 K 0.00000 0.00000 0.00000 0.00000 0.00000 A−0.00252 −0.00654 −0.00401 −0.00697 −0.00713 B 0.00002 −0.00030 −0.000230.00029 0.00029 C −0.00003 0.00004 0.00010 0.00006 0.00004 D 0.000000.00000 −0.00001 0.00000 0.00000 E 0.00000 0.00000 0.00000 0.000000.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G 0.00000 0.000000.00000 0.00000 0.00000 H 0.00000 0.00000 0.00000 0.00000 0.00000 J0.00000 0.00000 0.00000 0.00000 0.00000

Hereinafter, an optical imaging system according to the fourth examplewill be described with reference to FIG. 7.

The optical imaging system 400 includes a first lens 410, a second lens420, a third lens 430, a fourth lens 440, and a fifth lens 450.

The first lens 410 has positive refractive power. In the first lens 410,an object-side surface is convex and an image-side surface is convex.The second lens 420 has negative refractive power. In the second lens420, an object-side surface is concave and an image-side surface isconcave. The third lens 430 has positive refractive power. In the thirdlens 430, an object-side surface is convex and an image-side surface isconcave. The fourth lens 440 has negative refractive power. In thefourth lens 440, an object-side surface is convex and an image-sidesurface is concave. The fifth lens 450 has negative refractive power. Inthe fifth lens 450, an object-side surface is convex and an image-sidesurface is concave.

The optical imaging system 400 includes a filter IF and an image sensorIP. The filter IF may be disposed in front of the image sensor IP toblock infrared rays included in the incident light. The image sensor IPmay include a plurality of optical sensors. The above-configured imagesensor IP is configured to convert an optical signal into an electricalsignal. The image sensor IP may form an imaging plane for imaging lightincident through the first lens 410 to the fifth lens 450.

The optical imaging system 400 may include an optical path changingmechanism. For example, the optical imaging system 400 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 7 illustrates lens characteristics of the optical imaging system400, and Table 8 illustrates aspherical values of the optical imagingsystem 400. FIG. 8 is an aberration curve of the above-configuredoptical imaging system 400.

TABLE 7 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tive No.Remark Curvature Distance Index Number Radius S1 Prism Infinity 0.0005.057 S2 Infinity 5.500 1.723 29.5 5.000 S3 Infinity 5.500 1.723 29.57.000 S4 Infinity 3.000 5.000 S5 First 4.69 1.866 1.534 55.7 3.000 S6Lens −12.80 0.160 2.860 S7 −10.74 0.584 1.635 24.0 2.813 S8 Second 4.170.786 2.503 Lens S9 Third 4.69 1.247 1.671 19.2 2.529 S10 Lens 45.180.123 2.493 S11 Fourth 5.73 1.072 1.671 19.2 2.392 S12 Lens 3.45 2.8382.164 S13 Fifth 6.49 0.500 1.534 55.7 2.754 S14 Lens 6.79 5.563 2.756S15 Filter Infinity 0.210 1.519 64.2 3.651 S16 Infinity 3.051 3.675 S17Imaging Infinity 0.000 4.202 Plane

TABLE 8 Aspherical Constant S5 S6 S7 S8 S9 K −0.59765 0.00000 0.000000.00000 0.00000 A 0.00027 0.00190 0.00111 −0.00296 0.00022 B 0.000020.00003 0.00009 0.00003 −0.00001 C 0.00000 −0.00002 −0.00003 −0.00001−0.00002 D 0.00000 0.00000 0.00000 0.00000 0.00000 E 0.00000 0.000000.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.000000.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000 AsphericalConstant S10 S11 S12 S13 S14 K 0.00000 0.00000 0.00000 0.00000 0.00000 A−0.00271 −0.00688 −0.00323 −0.00777 −0.00805 B −0.00001 −0.00033−0.00019 0.00037 0.00037 C −0.00002 0.00005 0.00010 0.00005 0.00003 D0.00000 0.00000 −0.00001 0.00000 0.00000 E 0.00000 0.00000 0.000000.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G 0.000000.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.00000 0.000000.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

Hereinafter, an optical imaging system according to the fifth examplewill be described with reference to FIG. 9.

The optical imaging system 500 includes a first lens 510, a second lens520, a third lens 530, a fourth lens 540, and a fifth lens 550.

The first lens 510 has positive refractive power. In the first lens 510,an object-side surface is convex and an image-side surface is convex.The second lens 520 has negative refractive power. In the second lens520, an object-side surface is concave and an image-side surface isconcave. The third lens 530 has positive refractive power. In the thirdlens 530, an object-side surface is convex and an image-side surface isconvex. The fourth lens 540 has positive refractive power. In the fourthlens 540, an object-side surface is concave and an image-side surface isconvex. The fifth lens 550 has negative refractive power. In the fifthlens 550, an object-side surface is concave and an image-side surface isconvex.

The optical imaging system 500 includes a filter IF and an image sensorIP. The filter IF may be disposed in front of the image sensor IP toblock infrared rays included in the incident light. The image sensor IPmay include a plurality of optical sensors. The above-configured imagesensor IP is configured to convert an optical signal into an electricalsignal. The image sensor IP may form an imaging plane for imaging lightincident through the first lens 510 to the fifth lens 550.

The optical imaging system 500 may include an optical path changingmechanism. For example, the optical imaging system 500 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 9 illustrates lens characteristics of the optical imaging system500, and Table 10 illustrates aspherical values of the optical imagingsystem 500. FIG. 10 is an aberration curve of the above-configuredoptical imaging system 500.

TABLE 9 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tive No.Remark Curvature Distance Index Number Radius S1 Prism Infinity 0.0005.372 S2 Infinity 5.500 1.723 29.5 5.000 S3 Infinity 5.500 1.723 29.57.000 S4 Infinity 3.000 5.000 S5 First 4.47 3.200 1.534 55.7 2.700 S6Lens −7.41 0.578 2.378 S7 Second −2.85 0.533 1.615 26.0 2.192 S8 Lens125.72 0.400 2.010 S9 Third 55.59 0.942 1.671 19.2 2.009 S10 Lens −16.681.713 2.099 S11 Fourth −9.42 1.415 1.635 24.0 2.000 S12 Lens −5.33 0.1712.307 S13 Fifth −4.42 0.422 1.568 37.4 2.328 S14 Lens −9.74 1.020 2.490S15 Filter Infinity 0.110 1.519 64.2 2.740 S16 Infinity 7.496 2.754 S17Imaging Infinity 0.000 4.202 Plane

TABLE 10 Aspherical Constant S5 S6 S7 S8 S9 K −0.94399 0.00000 0.000000.00000 0.00000 A 0.16487 0.22316 1.03319 0.54973 −0.45227 B −0.03170−0.02234 −0.03289 −0.14628 −0.02671 C −0.00421 0.01010 0.04461 0.01317−0.01980 D 0.00772 −0.00024 0.00515 0.00441 0.00223 E 0.00741 0.001380.00819 0.00282 −0.00008 F 0.00406 0.00101 0.00317 −0.00210 0.00115 G0.00145 0.00090 0.00141 0.00048 −0.00042 H 0.00029 0.00063 0.000600.00268 −0.00005 J 0.00002 0.00014 0.00013 0.00078 0.00010 AsphericalConstant S10 S11 S12 S13 S14 K 0.00000 0.00000 0.00000 0.12131 −1.46894A −0.32026 −0.60435 −0.05772 0.54642 −0.62099 B 0.03807 0.19736 0.08001−0.12226 −0.07635 C 0.00806 −0.02954 −0.01694 0.11337 0.14267 D 0.004310.00951 −0.02083 −0.08315 −0.04046 E −0.00031 0.01364 0.00406 0.036810.00332 F 0.00066 −0.00573 0.00423 −0.00091 −0.00580 G 0.00041 −0.006310.00251 −0.00351 −0.00264 H 0.00037 −0.00034 0.00074 −0.00155 −0.00122 J0.00015 0.00051 0.00019 0.00471 0.00154

Hereinafter, an optical imaging system according to a sixth example willbe described with reference to FIG. 11.

The optical imaging system 600 includes a first lens 610, a second lens620, a third lens 630, a fourth lens 640, and a fifth lens 650.

The first lens 610 has positive refractive power. In the first lens 610,an object-side surface is convex and an image-side surface is convex.The second lens 620 has negative refractive power. In the second lens620, an object-side surface is concave and an image-side surface isconcave. The third lens 630 has positive refractive power. In the thirdlens 630, an object-side surface is convex and an image-side surface isconvex. The fourth lens 640 has negative refractive power. In the fourthlens 640, an object-side surface is concave and an image-side surface isconcave. The fifth lens 650 has positive refractive power. In the fifthlens 650, an object-side surface is convex and an image-side surface isconcave.

The optical imaging system 600 includes a filter IF and an image sensorIP. The filter IF may be disposed in front of the image sensor IP toblock infrared rays included in the incident light. The image sensor IPmay include a plurality of optical sensors. The above-configured imagesensor IP is configured to convert an optical signal into an electricalsignal. The image sensor IP may form an imaging plane for imaging lightincident through the first lens 610 to the fifth lens 650.

The optical imaging system 600 may include an optical path changingmechanism. For example, the optical imaging system 600 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 11 illustrates lens characteristics of the optical imaging system600, and Table 12 illustrates aspherical values of the optical imagingsystem 600. FIG. 12 is an aberration curve of the above-configuredoptical imaging system 600.

TABLE 11 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tiveNo. Remark Curvature Distance Index Number Radius S1 Prism Infinity0.000 3.610 S2 Infinity 2.200 1.723 29.5 4.000 S3 Infinity 2.200 1.72329.5 4.000 S4 Infinity 1.650 3.138 S5 First Lens 3.50 1.996 1.547 56.12.550 S6 −7.89 0.100 2.557 S7 Second −33.58 0.774 1.621 26.0 2.380 S8Lens 2.73 0.796 1.846 S9 Third Lens 4.75 0.828 1.679 19.2 1.792 S10−16.66 0.100 1.721 S11 Fourth −77.49 0.325 1.621 26.0 1.670 S12 Lens3.00 1.010 1.548 S13 Fifth Lens 4.07 0.710 1.547 56.1 1.600 S14 6.235.010 1.606 S15 Filter Infinity 0.210 1.519 64.2 2.487 S16 Infinity1.136 2.512 S17 Imaging Infinity 0.003 2.727 Plane

TABLE 12 Aspherical Constant S5 S6 S7 S8 S9 K −0.75263 0.00000 0.000000.00000 0.00000 A 0.00170 0.00288 −0.00871 −0.01357 −0.01114 B 0.000170.00023 0.00242 0.00436 0.00581 C −0.00003 0.00002 −0.00030 −0.00125−0.00099 D 0.00001 −0.00001 0.00001 0.00018 −0.00008 E 0.00000 0.000000.00000 −0.00001 0.00003 F 0.00000 0.00000 0.00000 0.00000 0.00000 G0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.000000.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000 AsphericalConstant S10 S11 S12 S13 S14 K 0.00000 0.00000 0.00000 0.00000 0.00000 A−0.01105 −0.00999 −0.02439 −0.02014 −0.01075 B 0.00853 0.00081 0.000680.00151 −0.00010 C −0.00188 0.00335 0.00439 0.00073 0.00092 D −0.00011−0.00138 −0.00091 0.00029 −0.00008 E 0.00005 0.00015 0.00002 −0.000060.00003 F 0.00000 0.00000 0.00000 0.00000 0.00000 G 0.00000 0.000000.00000 0.00000 0.00000 H 0.00000 0.00000 0.00000 0.00000 0.00000 J0.00000 0.00000 0.00000 0.00000 0.00000

Hereinafter, an optical imaging system according to a seventh examplewill be described with reference to FIG. 13.

The optical imaging system 700 includes a first lens 710, a second lens720, a third lens 730, a fourth lens 740, and a fifth lens 750.

The first lens 710 has positive refractive power. In the first lens 710,an object-side surface is convex and an image-side surface is convex.The second lens 720 has negative refractive power. In the second lens720, an object-side surface is concave and an image-side surface isconcave. The third lens 730 has positive refractive power. In the thirdlens 730, an object-side surface is convex and an image-side surface isconcave. The fourth lens 740 has negative refractive power. In thefourth lens 740, an object-side surface is convex and an image-sidesurface is concave. The fifth lens 750 has positive refractive power. Inthe fifth lens 750, an object-side surface is convex and an image-sidesurface is concave.

The optical imaging system 700 includes a filter IF and an image sensorIP. The filter IF may be disposed in front of the image sensor IP toblock infrared rays included in the incident light. The image sensor IPmay include a plurality of optical sensors. The above-configured imagesensor IP is configured to convert an optical signal into an electricalsignal. The image sensor IP may form an imaging plane for imaging lightincident through the first lenses 710 to the fifth lenses 750.

The optical imaging system 700 may include an optical path changingmechanism. For example, the optical imaging system 700 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 13 illustrates lens characteristics of the optical imaging system700, and Table 14 illustrates aspherical values of the optical imagingsystem 700. FIG. 14 is an aberration curve of the above-configuredoptical imaging system 700.

TABLE 13 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tiveNo. Remark Curvature Distance Index Number Radius S1 Prism Infinity0.000 3.610 S2 Infinity 2.200 1.723 29.5 4.000 S3 Infinity 2.200 1.72329.5 4.000 S4 Infinity 1.650 3.138 S5 First 3.66 1.677 1.537 55.7 2.450S6 Lens −10.29 0.041 2.314 S7 Second −75.50 1.044 1.621 26.0 2.201 S8Lens 3.30 1.400 1.757 S9 Third 4.12 0.681 1.679 19.2 1.618 S10 Lens33.89 0.150 1.526 S11 Fourth 27.09 0.507 1.621 26.0 1.467 S12 Lens 2.701.017 1.281 S13 Fifth 4.56 0.625 1.547 56.1 1.449 S14 Lens 9.45 5.0001.503 S15 Filter Infinity 0.110 1.519 64.2 2.553 S16 Infinity 1.0952.569 S17 Imaging Infinity 0.003 2.825 Plane

TABLE 14 Aspherical Constant S5 S6 S7 S8 S9 K −0.60081 −1.82822−31.05488 0.28745 0.43315 A 0.00075 0.00147 −0.00241 −0.00477 −0.00401 B0.00004 0.00000 0.00041 0.00030 0.00062 C 0.00000 0.00000 0.00000−0.00003 −0.00002 D 0.00000 0.00000 0.00000 0.00001 0.00000 E 0.000000.00000 0.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.000000.00000 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.000000.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000Aspherical Constant S10 S11 S12 S13 S14 K 5.67015 99.00000 0.23894−1.29539 −57.51740 A −0.00582 −0.00409 −0.00760 −0.01345 −0.00510 B0.00112 0.00026 0.00178 0.00168 0.00021 C 0.00006 0.00030 0.000560.00090 −0.00035 D 0.00005 −0.00001 0.00002 −0.00011 0.00029 E 0.000010.00000 −0.00011 −0.00001 0.00000 F 0.00000 −0.00001 −0.00001 0.00001−0.00001 G 0.00000 0.00000 0.00000 0.00000 0.00001 H 0.00000 0.000000.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

Hereinafter, an optical imaging system according to the eighth examplewill be described with reference to FIG. 15.

The optical imaging system 800 includes a first lens 810, a second lens820, a third lens 830, a fourth lens 840, and a fifth lens 850.

The first lens 810 has positive refractive power. In the first lens 810,an object side convex and an image side convex. The second lens 820 hasnegative refractive power. In the second lens 820, an object-sidesurface is concave and an image-side surface is concave. The third lens830 has positive refractive power. In the third lens 830, an object-sidesurface is convex and an image-side surface is concave. The fourth lens840 has negative refractive power. In the fourth lens 840, anobject-side surface is convex and an image-side surface is concave. Thefifth lens 850 has positive refractive power. In the fifth lens 850, anobject-side surface is convex and an image-side surface is concave.

The optical imaging system 800 includes a filter IF and an image sensorIP. The filter IF may be disposed in front of the image sensor IP toblock infrared rays included in the incident light. The image sensor IPmay include a plurality of optical sensors. The above-configured imagesensor IP is configured to convert an optical signal into an electricalsignal. The image sensor IP may form an imaging plane for imaging lightincident through the first lens 810 to the fifth lens 850.

The optical imaging system 800 may include an optical path changingmechanism. For example, the optical imaging system 800 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 15 illustrates lens characteristics of the optical imaging system800, and Table 16 illustrates aspherical values of the optical imagingsystem 800. FIG. 16 is an aberration curve of the above-configuredoptical imaging system 800.

TABLE 15 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tiveNo. Remark Curvature Distance Index Number Radius S1 Prism Infinity0.000 3.610 S2 Infinity 2.200 1.723 29.5 4.000 S3 Infinity 2.200 1.72329.5 4.000 S4 Infinity 1.650 3.138 S5 First 3.57 1.722 1.537 55.7 2.450S6 Lens −9.99 0.100 2.313 S7 Second −44.97 1.029 1.621 26.0 2.166 S8Lens 3.23 1.416 1.705 S9 Third 3.94 0.665 1.679 19.2 1.530 S10 Lens31.23 0.116 1.441 S11 Fourth 27.71 0.448 1.621 26.0 1.395 S12 Lens 2.640.903 1.220 S13 Fifth 4.62 0.720 1.547 56.1 1.380 S14 Lens 9.47 2.0011.438 S15 Filter Infinity 0.210 1.519 64.2 1.887 S16 Infinity 3.8511.919 S17 Imaging Infinity 0.004 2.820 Plane

TABLE 16 Aspherical Constant S5 S6 S7 S8 S9 K −0.61007 −1.44237−99.00000 0.28690 0.46067 A 0.00082 0.00165 −0.00275 −0.00554 −0.00457 B0.00005 −0.00001 0.00053 0.00038 0.00082 C 0.00000 0.00000 0.00000−0.00002 −0.00003 D 0.00000 0.00000 0.00000 0.00002 0.00000 E 0.000000.00000 0.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.000000.00000 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.000000.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000Aspherical Constant S10 S11 S12 S13 S14 K −10.57142 96.19935 0.28336−0.87741 −60.82116 A −0.00681 −0.00515 −0.00841 −0.01496 −0.00593 B0.00136 0.00012 0.00270 0.00238 0.00055 C 0.00004 0.00036 0.000990.00154 −0.00035 D 0.00006 −0.00002 0.00014 0.00000 0.00048 E 0.000010.00001 −0.00014 0.00001 0.00002 F −0.00001 −0.00001 0.00000 0.00000−0.00002 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.000000.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

Hereinafter, an optical imaging system according to the ninth examplewill be described with reference to FIG. 17.

The optical imaging system 900 includes a first lens 910, a second lens920, a third lens 930, a fourth lens 940, and a fifth lens 950.

The first lens 910 has positive refractive power. In the first lens 910,an object-side surface is convex and an image-side surface is convex.The second lens 920 has negative refractive power. In the second lens920, an object-side is concave and an image-side surface is concave. Thethird lens 930 has positive refractive power. In the third lens 930, anobject-side surface is convex and an image-side surface is concave. Thefourth lens 940 has negative refractive power. In the fourth lens 940,an object-side surface is convex and an image-side surface is concave.The fifth lens 950 has positive refractive power. In the fifth lens 950,an object-side surface is convex and an image-side surface is concave.

The optical imaging system 900 includes a filter IF and an image sensorIP. The filter IF may be disposed in front of the image sensor IP toblock infrared rays included in the incident light. The image sensor IPmay include a plurality of optical sensors. The above-configured imagesensor IP is configured to convert an optical signal into an electricalsignal. The image sensor IP may form an imaging plane for imaging lightincident through the first lens 910 to the fifth lens 950.

The optical imaging system 900 may include an optical path convertingmechanism. For example, the optical imaging system 900 may include aprism reflecting or refracting incident light in a directionintersecting an optical path of the incident light.

Table 17 illustrates lens characteristics of the optical imaging system900, and Table 18 illustrates aspherical values of the optical imagingsystem 900. FIG. 18 is an aberration curve of the above-configuredoptical imaging system 900.

TABLE 17 Sur- Refrac- Effec- face Radius of Thickness/ tive Abbe tiveNo. Remark Curvature Distance Index Number Radius S1 Prism Infinity0.000 3.610 S2 Infinity 2.200 1.723 29.5 4.000 S3 Infinity 2.200 1.72329.5 4.000 S4 Infinity 1.650 3.138 S5 First Lens 3.57 1.764 1.537 55.72.450 S6 −10.41 0.109 2.292 S7 Second −49.07 0.662 1.646 23.5 2.137 S8Lens 2.94 1.053 1.754 S9 Third Lens 3.42 0.775 1.679 19.2 1.705 S1073.66 0.188 1.621 S11 Fourth 43.58 0.869 1.646 23.5 1.531 S12 Lens 2.960.704 1.220 S13 Fifth Lens 6.34 0.416 1.537 55.7 1.380 S14 10.77 2.0011.382 S15 Filter Infinity 0.210 1.519 64.2 1.815 S16 Infinity 4.3451.845 S17 Imaging Infinity 0.003 2.822 Plane

TABLE 18 Aspherical Constant S5 S6 S7 S8 S9 K −0.60618 −1.21584−99.00000 0.28176 0.46564 A 0.00083 0.00163 −0.00274 −0.00563 −0.00452 B0.00005 −0.00001 0.00053 0.00041 0.00079 C 0.00000 0.00000 0.00000−0.00003 −0.00002 D 0.00000 0.00000 0.00000 0.00001 0.00000 E 0.000000.00000 0.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.000000.00000 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.000000.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000Aspherical Constant S10 S11 S12 S13 S14 K 22.60935 96.09024 0.30520−1.50913 −53.32311 A −0.00675 −0.00523 −0.00799 −0.01552 −0.00524 B0.00135 0.00017 0.00253 0.00268 0.00136 C 0.00001 0.00040 0.000790.00176 0.00011 D 0.00006 −0.00001 0.00024 0.00000 0.00034 E 0.000010.00001 −0.00014 0.00001 0.00002 F −0.00001 −0.00001 0.00000 0.00000−0.00002 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.000000.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

Table 19 illustrates optical characteristics of the optical imagingsystems according to the first to ninth examples.

TABLE 19 First Second Third Fourth Fifth Remark Example Example ExampleExample Example f 19.000 19.000 19.000 19.000 19.000 f1 6.798 7.2976.225 6.380 5.735 f2 −6.211 −6.117 −5.051 −4.571 −4.490 f3 8.817 6.51012.289 7.865 18.979 f4 −6.889 −6.091 −27.587 −18.532 16.836 f5 21.25425.893 201.798 −1335.159 −14.560 TTL 18.000 18.000 18.000 18.000 18.000BFL 8.992 9.741 8.920 8.824 8.627 f number 3.26 2.35 3.27 3.16 3.51ImgHT 4.2 4.2 4.2 4.2 4.2 Sixth Seventh Eighth Ninth Remark ExampleExample Example Example f 14.198 14.200 14.200 14.200 f1 4.729 5.2575.130 5.179 f2 −4.042 −5.063 −4.811 −4.273 f3 5.534 6.845 6.573 5.266 f4−4.648 −4.878 −4.736 −4.965 f5 19.278 15.428 15.710 27.784 TTL 12.99913.350 13.185 13.096 BFL 6.360 6.208 6.066 6.558 f number 2.61 2.89 2.892.93 ImgHT 2.72 2.82 2.82 2.82

Table 20 and Table 21 show values of conditional expressions of theoptical imaging systems according to the first to ninth examples. As canbe seen from Table 20 and Table 21, the optical imaging systemsaccording to the first to ninth examples satisfy all of theabove-mentioned conditional expressions.

TABLE 20 First Second Third Fourth Fifth Conditional Exam- Exam- Exam-Exam- Exam- Expression ple ple ple ple ple f number 3.2600 2.3500 3.27003.1600 3.5100 n2 + n3 3.2858 3.3099 3.2858 3.3057 3.2858 |f1 + f2|0.5874 1.1793 1.1744 1.8088 1.2443 |f/f1 + f/f2| 0.2643 0.5020 0.70971.1783 0.9181 D12/f 0.0053 0.0053 0.0059 0.0084 0.0304 EL1S1/ImgHT1.4119 1.4119 1.3810 1.4286 1.2857 EL1S2/EL1S1 0.9365 0.9028 0.91990.9534 0.8806 TTL/f 0.9474 0.9474 0.9474 0.9474 0.9474 TTL/ImgHT 4.28574.2857 4.2857 4.2857 4.2857 R1/f 0.2621 0.2608 0.2427 0.2467 0.2352T1/TTL 0.1178 0.1301 0.1232 0.1037 0.1778 Sixth Seventh Eighth NinthConditional Exam- Exam- Exam- Exam- Expression ple ple ple ple f number2.6100 2.8900 2.8900 2.9300 n2 + n3 3.2995 3.2995 3.2995 3.3244 |f1 +f2| 0.6874 0.1943 0.3193 0.9057 |f/f1 + f/f2| 0.5106 0.1036 0.18370.5812 D12/f 0.0070 0.0029 0.0070 0.0077 EL1S1/ImgHT 1.8750 1.73761.7376 1.7376 EL1S2/EL1S1 1.0027 0.9447 0.9441 0.9355 TTL/f 0.91560.9401 0.9285 0.9223 TTL/ImgHT 4.7790 4.7341 4.6756 4.6441 R1/f 0.24650.2581 0.2515 0.2512 T1/TTL 0.1536 0.1256 0.1306 0.1347

TABLE 21 First Second Third Fourth Fifth Conditional Exam- Exam- Exam-Exam- Exam- Expression ple ple ple ple ple BFL/f 0.4733 0.5127 0.46950.4644 0.4540 BFL/TTL 0.4996 0.5412 0.4955 0.4902 0.4793 BFL/ImgHT2.1409 2.3194 2.1237 2.1009 2.0540 f/ImgHT 2.1409 2.3194 2.1237 2.10092.0540 (D23 + D45)/ 0.3277 0.2535 0.4154 0.4107 0.0661 BFL D23/BFL0.1604 0.1275 0.0998 0.0891 0.0464 D45/BFL 0.1674 0.1260 0.3156 0.32160.0198 (D23 + D34 + 0.3388 0.2638 0.4266 0.4246 0.2647 D45)/BFL(L1S1:L5S2)/BFL 1.0018 0.8478 1.0180 1.0399 1.0866 (n2 + n4)/n3 1.93331.9622 1.9333 1.9786 1.9452 (V2 + V4)/V3 2.6988 2.4448 2.6988 2.24602.5954 Sixth Seventh Eighth Ninth Conditional Exam- Exam- Exam- Exam-Expression ple ple ple ple BFL/f 0.4480 0.4372 0.4272 0.4618 BFL/TTL0.4893 0.4650 0.4600 0.5008 BFL/ImgHT 2.3382 2.2013 2.1510 2.3256f/ImgHT 2.3382 2.2013 2.1510 2.3256 (D23 + D45)/ 0.2839 0.3894 0.38230.2679 BFL D23/BFL 0.1251 0.2255 0.2334 0.1605 D45/BFL 0.1588 0.16390.1488 0.1074 (D23 + D34 + 0.2996 0.4136 0.4014 0.2965 D45)/BFL(L1S1:L5S2)/BFL 1.0438 1.1505 1.1737 0.9970 (n2 + n4)/n3 1.9306 1.93061.9306 1.9603 (V2 + V4)/V3 2.6988 2.6988 2.6988 2.4448

Hereinafter, modified examples of an optical imaging system will bedescribed with reference to FIGS. 19 and 20.

The above-described optical imaging systems according to the first toninth examples may be configured in the form illustrated in FIG. 19 orFIG. 20. For example, the optical imaging system 100 according to thefirst examples includes one prism P1, as illustrated in FIG. 19, or twoprisms P1 and P2, as illustrated in FIG. 20.

Since the former form allows the optical imaging system 100 to bedisposed in a width direction of the portable terminal device, adistance TTL from an object-side surface of a first lens to an imagingplane of the first lens may be sufficiently secured. Since the latterform may sufficiently secure a distance BFL from an image-side surfaceof a fifth lens to an imaging plane of an image sensor, it may beadvantageous to implement an optical imaging system having a relativelylong BFL.

Next, portable terminal devices, each having an optical imaging systemaccording to an example of the present disclosure, will be describedwith reference to FIGS. 21 and 22.

The above-described optical imaging systems according to the first toninth examples and the optical imaging systems configured in the formsillustrated in FIGS. 19 and 20 may be mounted in a camera module for aportable terminal device. As an example, the optical imaging system 100according to the first example may be mounted in a rear camera module 20of a portable terminal device 10. As another example, the opticalimaging system 100 according to the first example may be mounted in oneor more of a plurality of camera modules 20, 22 and 24 mounted in theportable terminal device 10.

As described above, an optical imaging system, which may be mounted in athinned small-sized terminal device while having a large focal length,may be implemented.

While this disclosure includes specific examples, it will be apparentafter an understanding of the disclosure of this application thatvarious changes in forms and details may be made in these exampleswithout departing from the spirit and scope of the claims and theirequivalents. The examples described herein are to be considered in adescriptive sense only, and not for purposes of limitation. Descriptionsof features or aspects in each example are to be considered as beingapplicable to similar features or aspects in other examples. Suitableresults may be achieved if the described techniques are performed in adifferent order, and/or if components in a described system,architecture, device, or circuit are combined in a different manner,and/or replaced or supplemented by other components or theirequivalents. Therefore, the scope of the disclosure is defined not bythe detailed description, but by the claims and their equivalents, andall variations within the scope of the claims and their equivalents areto be construed as being included in the disclosure.

What is claimed is:
 1. An optical imaging system comprising: a firstlens, a second lens, a third lens having positive refractive power, afourth lens, and a fifth lens disposed in order from an object side,wherein 0.2<(D23+D34+D45)/BFL<0.95, and wherein 0.8<TTL/f<0.95, whereD23 is a distance from an image-side surface of the second lens to anobject-side surface of the third lens, D34 is a distance from animage-side surface of the third lens to an object-side surface of thefourth lens, D45 is a distance from an image-side surface of the fourthlens to an object-side surface of the fifth lens, BFL is a distance froman image-side surface of the fifth lens to an imaging plane, TTL is adistance from an object-side surface of the first lens to the imagingplane, and f is a focal length of the optical imaging system.
 2. Theoptical imaging system of claim 1, wherein the second lens has negativerefractive power.
 3. The optical imaging system of claim 1, wherein asum of a refractive index of the second lens and a refractive index ofthe third lens is greater than 3.20.
 4. The optical imaging system ofclaim 1, wherein an absolute value of a sum of a focal length of thefirst lens and a focal length of the second lens is less than 2.0. 5.The optical imaging system of claim 1, wherein|f/f1+f/f2|<1.2, where f1 is a focal length of the first lens and f2 isa focal length of the second lens.
 6. The optical imaging system ofclaim 1, wherein0≤D12/f≤0.07, where D12 is a distance from an image-side surface of thefirst lens to an object-side surface of the second lens.
 7. The opticalimaging system of claim 1, wherein0.62≤EL1S1/ImgHT≤0.94, where EL1S1 is an effective radius of theobject-side surface of the first lens and ImgHT is a height of theimaging plane.
 8. The optical imaging system of claim 1, wherein0.8≤EL1S2/EL1S1≤1.01, where EL1S1 is an effective radius of theobject-side surface of the first lens and EL1S2 is an effective radiusof an image-side surface of the first lens.
 9. The optical imagingsystem of claim 1, wherein3.5≤TTL/ImgHT, where ImgHT is a height of the imaging plane.
 10. Theoptical imaging system of claim 1, whereinR1/f≤0.265, where R1 is a radius of curvature of the object-side surfaceof the first lens.
 11. An optical imaging system comprising: a firstlens, a second lens, a third lens, a fourth lens, and a fifth lenshaving positive refractive index disposed in order from an object side,wherein 0.08<T1/TTL<0.18, where T1 is a thickness in a center of anoptical axis of the first lens and TTL is a length from an object-sidesurface of the first lens to an imaging plane.
 12. The optical imagingsystem of claim 11, wherein an image-side surface of the third lens isconcave.
 13. The optical imaging system of claim 11, wherein anobject-side surface of the fourth lens is convex.
 14. The opticalimaging system of claim 11, wherein an image-side surface of the fourthlens is concave.
 15. The optical imaging system of claim 11, wherein anobject-side surface of the fifth lens is convex.
 16. The optical imagingsystem of claim 11, wherein2.4<(V2+V4)/V3, where V2 is an Abbe number of the second lens, V3 is anAbbe number of the third lens, and V4 is an Abbe number of the fourthlens.